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                        序言
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        <li class="chapter " data-level="1" data-path="认识爬虫/introduceSpider.html">
            
                
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                            <b>1.</b>
                        
                        认识爬虫
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        <li class="chapter " data-level="1.1" data-path="认识爬虫/http.html">
            
                
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                            <b>1.1.</b>
                        
                        HTTP
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                            <b>1.2.</b>
                        
                        requests
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                            <b>1.3.</b>
                        
                        初步爬虫小项目
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                            <b>2.</b>
                        
                        正则表达式
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                            <b>2.1.</b>
                        
                        正则表达式练习
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                            <b>2.2.</b>
                        
                        正则表达式之后的第一个项目
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                            <b>2.3.</b>
                        
                        正则表达式常用表
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                            <b>2.4.</b>
                        
                        正则表达式重点
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                            <b>2.5.</b>
                        
                        正则表达式常问问题
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        <li class="chapter " data-level="2.6" data-path="正则表达式/正则爬虫练习.html">
            
                
                    <a href="../正则表达式/正则爬虫练习.html">
                
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                            <b>2.6.</b>
                        
                        正则爬虫项目练习
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        <li class="chapter " data-level="3" data-path="XPATH/xpath-in.html">
            
                
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                            <b>3.</b>
                        
                        XPATH
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        <li class="chapter " data-level="3.1" data-path="XPATH/Xpath.html">
            
                
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                            <b>3.1.</b>
                        
                        XPATH认识
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        <li class="chapter " data-level="3.2" data-path="XPATH/Xpath的代码例子.html">
            
                
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                            <b>3.2.</b>
                        
                        XPATH的代码例子
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        <li class="chapter " data-level="3.3" data-path="XPATH/xpath的爬虫练习.html">
            
                
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                            <b>3.3.</b>
                        
                        XPATH的爬虫练习
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        <li class="chapter " data-level="4" data-path="BeautifulSoup/BeautifulSoup.html">
            
                
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                            <b>4.</b>
                        
                        BeautifulSoup
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        <li class="chapter " data-level="4.1" data-path="BeautifulSoup/常用的css选择器.html">
            
                
                    <a href="../BeautifulSoup/常用的css选择器.html">
                
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                            <b>4.1.</b>
                        
                        常用的css选择器
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        <li class="chapter " data-level="4.2" data-path="BeautifulSoup/BeautifulSoup4的各种例子.html">
            
                
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                            <b>4.2.</b>
                        
                        BeautifulSoup4的各种例子
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                            <b>5.</b>
                        
                        ip代理池项目
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        <li class="chapter " data-level="6" data-path="Selenium/Selenium.html">
            
                
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                            <b>6.</b>
                        
                        Selenium
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        <li class="chapter " data-level="7" data-path="进程线程协程/introduce.html">
            
                
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                            <b>7.</b>
                        
                        进程线程协程
                    </a>
            
            
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        <li class="chapter " data-level="7.1" data-path="进程线程协程/gevent.html">
            
                
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                            <b>7.1.</b>
                        
                        gevent
                    </a>
            
            
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        <li class="chapter active" data-level="7.2" data-path="进程线程协程/green_let.html">
            
                
                    <a href="../进程线程协程/green_let.html">
                
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                            <b>7.2.</b>
                        
                        green_let
                    </a>
            
            
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        <li class="chapter " data-level="7.3" data-path="进程线程协程/yield.html">
            
                
                    <a href="../进程线程协程/yield.html">
                
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                            <b>7.3.</b>
                        
                        yield
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        <li class="chapter " data-level="7.4" data-path="进程线程协程/multiprecessing.html">
            
                
                    <a href="../进程线程协程/multiprecessing.html">
                
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                            <b>7.4.</b>
                        
                        multiprecessing
                    </a>
            
            
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        <li class="chapter " data-level="7.5" data-path="进程线程协程/threading.html">
            
                
                    <a href="../进程线程协程/threading.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>7.5.</b>
                        
                        threading
                    </a>
            
            
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            </ul>
            
        </li>
    
        <li class="chapter " data-level="8" data-path="scrapy框架/scrapy.html">
            
                
                    <a href="../scrapy框架/scrapy.html">
                
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                            <b>8.</b>
                        
                        Scrapy
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        <li class="chapter " data-level="8.1" data-path="scrapy框架/scrapy_setting.html">
            
                
                    <a href="../scrapy框架/scrapy_setting.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>8.1.</b>
                        
                        scrapy_setting
                    </a>
            
            
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        <li class="chapter " data-level="8.2" data-path="scrapy框架/模块作用.html">
            
                
                    <a href="../scrapy框架/模块作用.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>8.2.</b>
                        
                        模块作用
                    </a>
            
            
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        <li class="chapter " data-level="8.3" data-path="scrapy框架/19个中间件.html">
            
                
                    <a href="../scrapy框架/19个中间件.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>8.3.</b>
                        
                        19个中间件
                    </a>
            
            
        </li>
    

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        </li>
    
        <li class="chapter " data-level="9" data-path="scrapy-redis分布式/scrapy-redis.html">
            
                
                    <a href="../scrapy-redis分布式/scrapy-redis.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>9.</b>
                        
                        scrapy-redis分布式
                    </a>
            
            
            <ul class="articles">
                
    
        <li class="chapter " data-level="9.1" data-path="scrapy-redis分布式/scrapy-redis的改造方法.html">
            
                
                    <a href="../scrapy-redis分布式/scrapy-redis的改造方法.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>9.1.</b>
                        
                        scrapy-redis的改造方法
                    </a>
            
            
        </li>
    

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        <li class="chapter " data-level="10" data-path="spider_projects/introduce.html">
            
                
                    <a href="../spider_projects/introduce.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>10.</b>
                        
                        spider_projects
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        <li class="chapter " data-level="10.1" data-path="spider_projects/使用代理在普通爬虫脚本下.html">
            
                
                    <a href="../spider_projects/使用代理在普通爬虫脚本下.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>10.1.</b>
                        
                        使用代理在普通爬虫脚本下
                    </a>
            
            
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        <li class="chapter " data-level="10.2" data-path="spider_projects/xpath爬取前程无忧的数据.html">
            
                
                    <a href="../spider_projects/xpath爬取前程无忧的数据.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>10.2.</b>
                        
                        xpath爬取前程无忧的数据
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="10.3" data-path="spider_projects/存储数据库的脚本.html">
            
                
                    <a href="../spider_projects/存储数据库的脚本.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>10.3.</b>
                        
                        存储数据库的脚本
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="10.4" data-path="spider_projects/weibo.html">
            
                
                    <a href="../spider_projects/weibo.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>10.4.</b>
                        
                        爬取央视新闻微博
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="10.5" data-path="spider_projects/weibo2.html">
            
                
                    <a href="../spider_projects/weibo2.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>10.5.</b>
                        
                        爬取明星的微博
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="10.6" data-path="spider_projects/liepin.html">
            
                
                    <a href="../spider_projects/liepin.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>10.6.</b>
                        
                        爬取猎聘的职位信息Crawl
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="10.7" data-path="spider_projects/zhilianRe.html">
            
                
                    <a href="../spider_projects/zhilianRe.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>10.7.</b>
                        
                        纯正则爬取智联的职位信息
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="10.8" data-path="spider_projects/setting.html">
            
                
                    <a href="../spider_projects/setting.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>10.8.</b>
                        
                        scrapy中的setting
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="10.9" data-path="spider_projects/items.html">
            
                
                    <a href="../spider_projects/items.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>10.9.</b>
                        
                        scrapy中的items
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="10.10" data-path="spider_projects/pipeline.html">
            
                
                    <a href="../spider_projects/pipeline.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>10.10.</b>
                        
                        scrapy中的pipeline
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="10.11" data-path="spider_projects/middlewares.html">
            
                
                    <a href="../spider_projects/middlewares.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>10.11.</b>
                        
                        scrapy中的middlewares
                    </a>
            
            
        </li>
    
        <li class="chapter " data-level="10.12" data-path="spider_projects/框架中的代码运行脚本.html">
            
                
                    <a href="../spider_projects/框架中的代码运行脚本.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>10.12.</b>
                        
                        框架中的代码运行脚本
                    </a>
            
            
        </li>
    

            </ul>
            
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        <li class="chapter " data-level="11" data-path="爬虫的面试题/面试题1-10.html">
            
                
                    <a href="../爬虫的面试题/面试题1-10.html">
                
                        <i class="fa fa-check"></i>
                        
                            <b>11.</b>
                        
                        爬虫面试题
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                        <h1 id="&#x7528;greenlet&#x5B9E;&#x73B0;python&#x4E2D;&#x7684;&#x5E76;&#x53D1;&#xFF1A;">&#x7528;greenlet&#x5B9E;&#x73B0;Python&#x4E2D;&#x7684;&#x5E76;&#x53D1;&#xFF1A;</h1>
<hr>
<h2 id="&#x4E0B;&#x9762;&#x662F;greenlet&#x7684;&#x4F8B;&#x5B50;&#xFF1A;">&#x4E0B;&#x9762;&#x662F;greenlet&#x7684;&#x4F8B;&#x5B50;&#xFF1A;</h2>
<pre><code class="lang-python"><span class="hljs-keyword">from</span> greenlet <span class="hljs-keyword">import</span> greenlet
<span class="hljs-comment"># greenlet &#x5176;&#x5B9E;&#x5C31;&#x662F;&#x624B;&#x52A8;&#x5207;&#x6362;&#xFF1B;gevent&#x662F;&#x5BF9;greenlet&#x7684;&#x5C01;&#x88C5;&#xFF0C;&#x53EF;&#x4EE5;&#x5B9E;&#x73B0;&#x81EA;&#x52A8;&#x5207;&#x6362;</span>

<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">test1</span><span class="hljs-params">()</span>:</span>
    print(<span class="hljs-string">&quot;123&quot;</span>)
    gr2.switch()   <span class="hljs-comment"># &#x5207;&#x6362;&#x53BB;&#x6267;&#x884C;test2</span>
    print(<span class="hljs-string">&quot;456&quot;</span>)
    gr2.switch()   <span class="hljs-comment"># &#x5207;&#x6362;&#x56DE;test2&#x4E4B;&#x524D;&#x6267;&#x884C;&#x5230;&#x7684;&#x4F4D;&#x7F6E;&#xFF0C;&#x63A5;&#x7740;&#x6267;&#x884C;</span>

<span class="hljs-function"><span class="hljs-keyword">def</span> <span class="hljs-title">test2</span><span class="hljs-params">()</span>:</span>
    print(<span class="hljs-string">&quot;789&quot;</span>)
    gr1.switch()   <span class="hljs-comment"># &#x5207;&#x6362;&#x56DE;test1&#x4E4B;&#x524D;&#x6267;&#x884C;&#x5230;&#x7684;&#x4F4D;&#x7F6E;&#xFF0C;&#x63A5;&#x7740;&#x6267;&#x884C;</span>
    print(<span class="hljs-string">&quot;666&quot;</span>)


gr1 = greenlet(test1)   <span class="hljs-comment"># &#x542F;&#x52A8;&#x4E00;&#x4E2A;&#x534F;&#x7A0B; &#x6CE8;&#x610F;test1&#x4E0D;&#x8981;&#x52A0;()</span>
gr2 = greenlet(test2)   <span class="hljs-comment">#</span>
gr1.switch()
</code></pre>
<h3 id="&#x5206;&#x6790;&#x5982;&#x4E0B;&#xFF1A;">&#x5206;&#x6790;&#x5982;&#x4E0B;&#xFF1A;</h3>
<p>&#x8FD9;&#x91CC;&#x521B;&#x5EFA;&#x4E86;&#x4E24;&#x4E2A;greenlet&#x534F;&#x7A0B;&#x5BF9;&#x8C61;&#xFF0C;gr1&#x548C;gr2&#xFF0C;</p>
<p>&#x5206;&#x522B;&#x5BF9;&#x5E94;&#x4E8E;&#x51FD;&#x6570;test1()&#x548C;test2()&#x3002;&#x4F7F;&#x7528;greenlet&#x5BF9;&#x8C61;&#x7684;switch()&#x65B9;&#x6CD5;&#xFF0C;&#x5373;&#x53EF;&#x4EE5;&#x5207;&#x6362;&#x534F;&#x7A0B;&#x3002;</p>
<p>&#x4E0A;&#x4F8B;&#x4E2D;&#xFF0C;&#x6211;&#x4EEC;&#x5148;&#x8C03;&#x7528;&#x201D;gr1.switch()&#x201D;&#xFF0C;&#x51FD;&#x6570;test1()&#x88AB;&#x6267;&#x884C;&#xFF0C;&#x7136;&#x540E;&#x6253;&#x5370;&#x51FA;&#x201D;123&#x2033;&#xFF1B;</p>
<p>&#x63A5;&#x7740;&#x7531;&#x4E8E;&#x201D;gr2.switch()&#x201D;&#x88AB;&#x8C03;&#x7528;&#xFF0C;&#x534F;&#x7A0B;&#x5207;&#x6362;&#x5230;&#x51FD;&#x6570;test2()&#xFF0C;&#x6253;&#x5370;&#x51FA;&#x201D;789&#x2033;&#xFF1B;</p>
<p>&#x4E4B;&#x540E;&#x201D;gr1.switch()&#x201D;&#x53C8;&#x88AB;&#x8C03;&#x7528;&#xFF0C;&#x6240;&#x4EE5;&#x53C8;&#x5207;&#x6362;&#x5230;&#x51FD;&#x6570;test1()&#x3002;</p>
<p>&#x4F46;&#x6CE8;&#x610F;&#xFF0C;&#x7531;&#x4E8E;&#x4E4B;&#x524D;test1()&#x5DF2;&#x7ECF;&#x6267;&#x884C;&#x5230;&#x7B2C;5&#x884C;&#xFF0C;&#x4E5F;&#x5C31;&#x662F;&#x201D;gr2.switch()&#x201D;&#xFF0C;</p>
<p>&#x6240;&#x4EE5;&#x5207;&#x6362;&#x56DE;&#x6765;&#x540E;&#x4F1A;&#x7EE7;&#x7EED;&#x5F80;&#x4E0B;&#x6267;&#x884C;&#xFF0C;&#x4E5F;&#x5C31;&#x662F;&#x6253;&#x5370;&#x201D;456&#x2033;&#xFF1B;</p>
<p>&#x4E4B;&#x540E;&#x201D;gr2.switch()&#x201D;&#x53C8;&#x88AB;&#x8C03;&#x7528;&#xFF0C;&#x6240;&#x4EE5;&#x53C8;&#x5207;&#x6362;&#x5230;&#x51FD;&#x6570;test2()&#x3002;</p>
<p>&#x63A5;&#x7740;&#x7531;&#x4E8E;&#x201D;gr2.switch()&#x201D;&#x53C8;&#x88AB;&#x8C03;&#x7528;&#xFF0C;&#x534F;&#x7A0B;&#x5207;&#x6362;&#x5230;&#x51FD;&#x6570;test2()&#xFF0C;&#x5207;&#x6362;&#x56DE;test1&#x4E4B;&#x524D;&#x6267;&#x884C;&#x5230;&#x7684;&#x4F4D;&#x7F6E;&#xFF0C;&#x63A5;&#x7740;&#x6267;&#x884C;&#xFF0C;&#x6253;&#x5370;&#x51FA;&#x201D;666&#x2033;&#xFF1B;</p>
<p>&#x73B0;&#x5728;&#x51FD;&#x6570;test2()&#x9000;&#x51FA;&#xFF0C;&#x540C;&#x65F6;&#x7A0B;&#x5E8F;&#x9000;&#x51FA;&#x3002;</p>
<h3 id="&#x6267;&#x884C;&#x7ED3;&#x679C;&#xFF1A;">&#x6267;&#x884C;&#x7ED3;&#x679C;&#xFF1A;</h3>
<pre><code class="lang-python"><span class="hljs-number">123</span>
<span class="hljs-number">789</span>
<span class="hljs-number">456</span>
<span class="hljs-number">666</span>
</code></pre>
<p>&#x5176;&#x5B9E;greenlet&#x534F;&#x7A0B;&#x7684;&#x5B9E;&#x73B0;&#x5C31;&#x662F;&#x4F7F;&#x7528;&#x4E86;&#x6808;&#xFF0C;&#x5176;&#x8FD0;&#x884C;&#x7684;&#x4E0A;&#x4E0B;&#x6587;&#x4FDD;&#x5B58;&#x5728;&#x6808;&#x4E2D;&#xFF0C;&#x201D;main&#x201D;&#x4E3B;&#x534F;&#x7A0B;&#x5904;&#x4E8E;&#x6808;&#x5E95;&#x7684;&#x4F4D;&#x7F6E;&#xFF0C;&#x800C;&#x5F53;&#x524D;&#x8FD0;&#x884C;&#x4E2D;&#x7684;&#x534F;&#x7A0B;&#x5C31;&#x5728;&#x6808;&#x9876;&#x3002;</p>
<p>&#x8FD9;&#x540C;&#x51FD;&#x6570;&#x662F;&#x4E00;&#x6837;&#x3002;&#x6B64;&#x5916;&#xFF0C;&#x5728;&#x4EFB;&#x4F55;&#x65F6;&#x5019;&#xFF0C;&#x4F60;&#x90FD;&#x53EF;&#x4EE5;&#x4F7F;&#x7528;&#x201D;greenlet.getcurrent()&#x201D;&#xFF0C;&#x83B7;&#x53D6;&#x5F53;&#x524D;&#x8FD0;&#x884C;&#x4E2D;&#x7684;&#x534F;&#x7A0B;&#x5BF9;&#x8C61;&#x3002;&#x6BD4;&#x5982;&#x5728;&#x51FD;&#x6570;test2()&#x4E2D;&#x6267;&#x884C;&#x201D;greenlet.getcurrent()&#x201D;&#xFF0C;&#x5176;&#x8FD4;&#x56DE;&#x5C31;&#x7B49;&#x4E8E;&#x201D;gr2&#x2033;&#x3002;</p>

                    
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